WV CDL AIR BRAKES PRACTICE TEST
6.
Which of the following can cause brakes to fade or fail?
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Brakes out of adjustment
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Not relying on the engine braking effect
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Excessive use of the service brakes
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All of the above.
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7.
Air tank drains:
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are used to move air to the brakes.
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are used to remove water and oil from the air tanks.
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protect the tanks and the rest of the system from too much pressure.
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should not be used in wet weather.
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8.
Typically an air system is fully-charged at:
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125 psi
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25 psi
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75 psi
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250 psi
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9.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the trailer will stop normally.
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the ABS won't work properly.
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All of the above.
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10.
The safety relief valve is located:
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on each end of the vehicle's axles.
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in the first tank the air compressor pumps air to.
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on the dashboard.
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in the front brake.
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